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nidge n



Member Since: 04 Feb 2012
Location: Cheshire
Posts: 720
 
Could this be a Brake switch issue?
Hello all,

Gremlins have come to revisit me and this is the present they have left. Each time i press the brakes the interior dash board lights come on. The brake lights work ok. Rather than start searching for an earthing or a shorting issue, i am reaching out to see if anyone has experienced this issue and if the outcome was a faulty brake switch.

Many thanks for your help

Nigel
Post #952248 11th May 2022 10:30am
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Marks Landy



Member Since: 09 Feb 2015
Location: Cheshire
Posts: 304
United Kingdom 1985 Defender 90 200 Tdi SW Java Black
How’s the level in the brake reservoir ?
Post #952252 11th May 2022 11:46am
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nidge n



Member Since: 04 Feb 2012
Location: Cheshire
Posts: 720
 
Hi Mark, brake level seems to be ok, settling on the high level line.
Post #952258 11th May 2022 12:52pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17623
United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
The first thing I would try is disconnecting the harness from the brake light switch and shorting the terminals on the harness-side connector. This would allow you to determine if it is the movement of the pedal grounding something (trapped wire etc) or if it is a short between the brake light circuit and the interior light.

The interior light is a switch-to-ground circuit so it is possible that is it a strange earth fault, and when you press the pedal the brake lights provide a path to earth.
Post #952287 11th May 2022 4:54pm
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nidge n



Member Since: 04 Feb 2012
Location: Cheshire
Posts: 720
 
my job for tomorrow, thanks for helping
Post #952308 11th May 2022 7:19pm
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Dinnu



Member Since: 24 Dec 2019
Location: Lija
Posts: 3493
Malta 2012 Defender 90 Puma 2.2 CSW Santorini Black
Is it the dash illumination or the Interior light that is coming on?

I would check if they are simultaneously coming on together. So either with the help of an assistant, ir park it with the rear against a wall so you can see when the brake lights are on, slowly press the brake pedal until either one comes on.

If they light up simultaneously, then most likely a poor earth that is causing a potential on the illumination/light. If one comes on after the other, then something chafing on the pedal itself. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black
Post #952313 11th May 2022 7:57pm
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